Johnstone Supply

Johnstone Supply operates as a heating equipment supplier in Mahwah, New Jersey, serving contractors and trades professionals across northern New Jersey communities. The location holds a 5-star rating from 19 reviews and maintains weekday hours from 7 AM to 5 PM, with Saturday and Sunday closed. This is a contractor-only supply house, meaning it does not perform installations for homeowners but instead provides parts, equipment, and expertise to licensed HVAC professionals serving the residential and commercial markets. The Mahwah branch works alongside a sister location in Saddle Brook to serve the broader Bergen County and Passaic County contractor networks.

The website showcases an extensive inventory spanning multiple HVAC categories, including single packaged units, split systems, mini-split systems, variable capacity systems, air handlers, evaporator coils, gas furnaces, and oil furnaces. Johnstone Supply carries residential unitary equipment alongside commercial solutions, and offers field-installed accessories and extended warranties. The company provides contractor tools, cross-reference search capabilities, and account management through its digital platform, enabling professionals to quickly locate parts and check stock across locations.

Customer reviews consistently highlight specific team members who deliver exceptional service. AJ at the Mahwah branch receives repeated mentions for readiness to assist with any contractor need, while reviewers also call out Will, Danny, John, Jimmy, and Jess at both the Mahwah and Saddle Brook locations. One contractor describes the team as organized, efficient, and possessing whatever is needed, noting they handle everything from routine supply runs to complex situations requiring creative problem-solving. The reviews emphasize that staff members help identify alternatives when specific parts are unavailable and reliably maintain stock for same-day job completion.